US3573377A - Equipment to coordinate establishment of audio and video connections through switching systems - Google Patents

Equipment to coordinate establishment of audio and video connections through switching systems Download PDF

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Publication number
US3573377A
US3573377A US801575A US3573377DA US3573377A US 3573377 A US3573377 A US 3573377A US 801575 A US801575 A US 801575A US 3573377D A US3573377D A US 3573377DA US 3573377 A US3573377 A US 3573377A
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Prior art keywords
audio
video
connection
switching system
called
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US801575A
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Harold P Anderson
James L Simon
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AT&T Corp
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Bell Telephone Laboratories Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H04N7/147—Communication arrangements, e.g. identifying the communication as a video-communication, intermediate storage of the signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Definitions

  • a video switching system is provided for augmenting an existing audio switching system to extend video paths between customer video equipments.
  • the video and audio paths are essentially independently established via separate switching system networks and equipment is included for coordinating and verifying each system connection to as- 3, 062,918 11/1962 Williford 179/7 sureonl matchin audio and video aths are established.
  • FIG. 2A AUDI O CONVERTER TO OTHER I SWITCHING CONVERTERS L EQQ'ELE L VIDEO 6 swn'cTNNc, w 22 5 EQUIPMEN CONTROL CONNECTOR e DUEUOH TT- scsc ,TT i VIDEO /6 2a CONTROL g v1 J v2 3 VIDEO 1 were VIDEO LINE N NETwoRK CU EQUIPMENT TO COORDINATE ESTABLISHMENT OF AUDIO AND VIDEO CONNECTIONS THROUGH SWITCHING SYSTEMS BACKGROUND OF THE INVENTION
  • Our invention concerns communication equipment and particularly, switching arrangements including separate switching networks for independently establishing path connections between customer stations. More particularly the invention relates to apparatus for controlling the separate establishment of video path connections to augment audio switching facilities.
  • Facilities for furnishing visual and also audio communications between telephone customers are necessarily more complicated and require more sophisticated control circuitry than audio-only switching arrangements. For example, paths conveying video communication signals require a wider bandwidth capability than audio signal paths since video signals contain higher frequency components. Also, such facilities must be selectively capable of establishing audio-only, or video and audio paths on a particular call as required by calling customers.
  • a video switching network is directly controlled by the existing audio network so that it is essentially in parallel with the latter network and there is a l to 1 correspondence between voice and video paths. That arrangement is manifestly inefficient because initially full video switching capability is furnished for all customer lines although customarily only a small percentage of customers are equipped with video station apparatus.
  • an independently operated video switching system augments an existing audio switching system, illustratively a step-by-step switching system, for furnishing under control of customary calling signals separate video path connections to supplement mating audio path connections established via the existing system.
  • the separate video system can be advantageously tailored to the video call traffic-the video network paths being provided solely on the basis of the video system traffic and grade of service desired. Accordingly, the size of the video network is independent of the network of the audio switching system and it may be minimized thereby reducing the cost of providing video call service.
  • the audio and video systems operate substantially independent of one another in the actual'call establishment, and their action is coordinated -to the extent required for insuring that separate video and audio connections to a called line match.
  • circuitry is advantageously included in the video switching system and actuated on each video-audio call to delay the completion of the corresponding audio connection until the video connection is completed.
  • the corresponding called audio line circuit is made busy to prevent other audio call connections (not associated with the video-audio call in progress) from being extended to the called line.
  • the busy condition is removed and the proper audio connection, also directed to proceed at that same moment by the video system, is established.
  • apparatus is included to verify each established video-audio connection to determine that the desired audio portion of the connection is established between the proper stations.
  • a signal is connected to the audio path by the video system and it is coupled at both calling and called audio line circuits via test leads to the video system.
  • the latter system which stores the identity of the calling and called parties during a call utilizes the stored data to locate and monitor a pair of the test leads which pair corresponds to the parties interconnected by the video network. If the signal is not detected by the video system on both leads within a prescribed time the audio and video connections are mismatched and the video connection is released leaving the established audio path connected.
  • a caller desires an audio-video call connection, he dials a special service code preceding the dialing of the address of the called customer.
  • the code and address in the illustrative embodiment, are stored in a converter of the step-by-step audio system which converts customer generated multifrequency signals into dial pulse signals for operating the switch train.
  • a video control circuit is actuated for initiating the establishment of the video path.
  • the latter circuit sends a signal to the converter for directing it to outpulse all digits except the last digit which is withheld and stored by the converter.
  • the audio path is established through the first and intermediate selectors of the train and to the connector switch level assigned to the called customer but not onto the called customer terminal. While the latter connection is being established, the video control circuit determines the video network appearances both for the calling and called video line circuits, makes a busy test of the called line and, if idle, completes the video path entirely through a separate video network. When the video path is completed the corresponding called customer line appearance in the audio system is made busy temporarily to all audio call connections. The audio path is subsequently completed when the withheld digit is outpulsed and received at the connector switch. The transmission of the latter digit is synchronized with the unbusying of the called customer line appearance by the video network in order that the mating audio connection can be completed.
  • the video control circuit releases, abandoningthe video connection.
  • the audio connection proceeds in a customary manner.
  • a feature of our invention is the provision of video switching equipment which is controlled by customary calling signals to establish video path connections as required in conjunction with corresponding audio path connections set up by a separate switching system.
  • Another feature of our invention pertains to equipment for controlling and insuring the establishment of mating, or associated, audio and video connections via separate switching systems between common calling and called customer lines.
  • a further feature relates to verification circuitry which is controllable after audio and video paths are established for verifying that both paths connect between common calling and called customer lines.
  • FIG. 1 is a block diagram showing the video switching equipment and control connections to audio switching equipment in accordance with one illustrative embodiment of our invention
  • FIG. 2A depicts the circuitry of converter 1, convertervideo control connector 5 and prefix digit detector 6;
  • FIG. 2B shows video control 2
  • FIG. 3 discloses the called customer audio and video line circuits L2 and V2, respectively.
  • our video switching equipment may facilely augment any of various types of audio switching systems.
  • an audio switching system a stepby-step private branch exchange of the type in wide commercial use and having the capability of establishing two wire audio paths between customer lines.
  • Such an exchange is disclosed in [15. Pat. No. 3,133,155 to F. C. Kuchas of May I2, 1964. It is to be understood, however, that the present invention is not limited in application to augmenting step-by-step systems, but may be utilized with common control switching systems.
  • the equipment of our invention is capable of establishing connection for conveying data messages as well as video signals.
  • FIGS. and to details of our circuitry it is considered that the best mode of illustrating the circuit functions and their interrelationships is to describe a call beginning at a point when a caller lifts his handset to initiate a videoaudio call and to follow the equipment operation through to the point when both the video and audio paths are completed and verified. Preliminary to that description some of the circuits which are involved in the call establishment are separately considered.
  • FIG. 1 there is shown calling and called customer equipment which includes a telephone subset and station video apparatus. Each customer subset connects to a station line circuit, L1 and L2, and the video apparatus connects to video line circuits, V1 and V2.
  • FIG. 1 further shows two self-contained switching systems labeled audio switching equipment and video switching equipment" capable respectively of establishing audio and video call connection paths between the aforementioned line circuits.
  • the audio switching system comprises the usual step-by-step telephone switching'system which includes linefinder F, first selector SEL, and connector C. Unlike most conventional step-by-step telephone switching system, however, converter trunk 4 is interposed between linefinder F and first selector SEL in the manner disclosed in the Kuchas patent.
  • converter trunk 4 When the calling customer served by finder F goes off-hook, converter trunk 4 is connected to the calling subset and a connection between trunk 4 and an idle converter 1 is established via trunk and converter finder stages (not shown). It is the function of converter 1 to convert customer generated frequency signals into dial pulses suitable for controlling the customary operation of selector SEL, other intermediate selectors and connector C to process call connections.
  • the video switching equipment comprises in addition to the aforementioned video line circuits V1 and V2, a video control 2, prefix digit detector 6, video network 3 and converter'video control connector 5.
  • An important circuit of the video equipment is video control 2 which is actuated each time a customer generated video call request signal is detected in converter I for controlling the establishment of video path connections concurrently with the establishment of audio path connections.
  • Converter trunk 4 is also actuated and it serves to start trunk and converter finder switches (not shown) to establish a connection between trunk 4 and an idle converter 1. After that connection is established, the first selector SEL is seized over a path which includes the station loop of the calling station.
  • connection between the station loop and selector SEL is split at trunk 4 so that the station loop connects to converter 1 via leads T, R and S and the selector SEL is held via leads FT and FR.
  • Dial tone is returned to the caller by converter 1 over the'split path to indicate the converter connection and also that the caller may commence dialing.
  • the caller indicates that an audio-video connection is desired rather than a conventional audio-only by dialing a prefix, or special video service code, before dialing the called number address code.
  • the prefix which is conveyed over the split path between the line circuit L1 and converter 1, is recorded in converter 1.
  • FIG. 2A Details of the circuitry of converter 1 are shown in FIG. 2A. It is noted, however, only portions of that circuit necessary to an understanding of our invention have been reproduced. For additional details reference may be made to the Kuchas patent. The designations used in the Kuchas patent are also used herein to point up the correspondence between identical functional units. With reference onceagain to the call, the prefix digit as well as the called customer address code is stored in called digit memory 208. To accommodate the storage of the extra digit. i.e., the prefix digit, an additional storage unit in memory 208 is added in a customary manner to the circuitry of Kuchas.
  • Prefix digit detector 6 monitors the recorded digits in converter 1 to determine the presence of the customer dialed special video service code for actuating the video path connection equipment and for connecting video control 2 to converter 1 via converter-video control connector 5.
  • Relay 2PD of detector 6 connects to memory 208 via lead q and it operates when the special service code is recorded.
  • Operated contact 2PD-1 connects ground to leads w and b for activating converter-video control connector 5 and the video start circuit 10 of video control 2. The latter is disclosed in detail in FIG. 2B which should be positioned below FIG. 2A.
  • Converter-video control connector 5 comprises preference circuitry for allotting the connection of converters, only one of which is shown in the illustrative embodiment, to video control 2.
  • switches SW1, SW2 and SW3 are operated to connect cable p and x and leads b, T and R from converter I to control 2.
  • Switches SWI, SW2 and SW3 are illustrative and in actuality, the circuits closed by those switches are closed by contacts on preference or connector relays of connector 5.
  • Such preference and connecting circuitry is conventional and for ease in presentation, that circuitry is omitted and instead switches are shown.
  • video start circuit of FIG. 28 sends an instruction signal to stop-outpulse control 11 and the latter, in turn, sends a signal via cable x and operated switch SW3 to out steering 210 and totiming 204, both of converter 1.
  • it is the function of out steering 210, as disclosed in Kuchas, to control the transmission of digits stored in digit memory 208 to generator 205 which outpulses the digits to the switch train.
  • the instruction signal out steering 210 upon the receipt of the instruction signal out steering 210 withholds the transmission of the last digit to generator 205 allowing the other digits to be outpulsed. in this manner the audio path is partially established, i.e., through first selector SEL and intermediate selectors and through connector C which steps up to the proper level and is awaiting the last digit to connect to the called customer switch terminal appearance.
  • the instruction signal received at timing 204 changes the customary time-out operation by lengthening the time-out in-.
  • video control 2 To locate the calling and called video line circuits V1 and V2 on video network 3, to select an idle network 3 link, busy test the called customer terminal and direct the establishment of the video path at the proper time.
  • the location of calling video line circuit V1 on network 3 is determined by connecting an identity signal to leads T and R at converter 1 and by scanning via leads SC for that signal at the audio line circuits. Since there is a predetermined correspondence between audio and corresponding video line circuits and the customer terminal assignment in network 3, the determination of the calling audio line circuit identity also determines the terminal location in network 3. Specifically, video start circuit 10 of FIG. 28 sends a signal to identity signal connector 12 which, in turn, couples to leads T and R a special signal which is developed by identity signal generator 13. This signal may be traced through switch SW1, converter 1, trunk and converter finder switches, converter trunk 4 and linefinder F to line circuit L1. Video control 2, in particular at identity signal scanner 14, connects to each line circuit. When the identity signal is present, scanner 14 via leads SCOSCn locates the particular line circuit, such as calling circuit L1 in the present example, and causes the corresponding video line circuit network location to be stored in calling line video network store 15.
  • circuitry for connecting signals to network path connections and detecting such signals at line circuits in substantially the same manner as described hereinabove, reference may be made to the equipment commonly employed in automatic number identification systems such as for example disclosed in US. Pat. No. 3,062,918 to O. Williford of Nov. 6, 1962. Such equipment may illustratively be utilized to locate calling customer line circuit L1 in the present em bodiment.
  • the network location of called customer video line circuit V2 is determined by called line number register and translator 16 from a translation of the dialed address code. It will be recalled that the customer dialed digits are stored in called digit memory 208. When switch SW2 is closed, the stored address code is sent via cable p to called line number register and translator 16. The latter converts this information in a customary manner into the equipment location of circuit V2 on network 3.
  • This circuit function is analogous to conventional number group translation which is described in US. Pat. No. 2,585,904 to A. J. Busch of Feb. I9, 1952.
  • the called customer line circuit L2 is tested by video control 2 to determine its busy-idle condition. This is done by called line busyidle test 18 over test leads TTO-TIn which extend to every audio line circuit. If either or both of the corresponding audio and video circuits L2 and V2 are busy, a busy indication is returned by the audio line circuit. Referring now to FIG. 3 showing the customer line circuitry, if ground appears on lead TT(On) the called customer is busy and if no potential (open) is detected thereon the called circuit is idle.
  • video network control 17 determines that the busy-idle status of the called terminal is required when both the calling and called customer network locations are registe'red respectively in store 15 and translator 16.
  • Control 17 couples the network location of the called customer recorded in translator 16 to called line busy-idle test 18 and this-location information determines which one of leads THO-n) are to be tested. if the test determination is that the called line is busy or the called customer does not have video equipment, the call is blocked and is thereafter treated in the manner dis closed under the section headed Call Blockages.”
  • test 18 returns a signal to control 17 which selects an idle link from one of the links recorded in idle video network link memory 19 and directs the establishment of the video connection through network 3.
  • the video switching equipment includes circuitry for insuring that the audio-path connection completed to called line circuit L2 after the video path is established between circuits V1 and V2 is solely from circuit Ll. It must be remembered that the audio and video switching equipments are different switching units and respond to call address signals essentially independently of one another. Without circuitry to insure that established audio and video path connections match, an incongruous situation might arise wherein the audio and the video equipment of the called customer is each connected to different calling customers.
  • the video switching equipment directs the audio switching equipment to complete the audio-path connection.
  • the action of both the called line circuit and of the audio switching equipment is synchronized during the completion of that call so that the probability that a foreign audio call connection can interfere with the proper connection is extremely remote.
  • the video path through network 3 is completed over leads Tl, R1, T2 and R2 and line circuit V2 to the called customer.
  • circuitry of the calling video line circuit V1 connects ground to lead ID for operating relay 3R in circuit V2.
  • Operated contact 3R2 removes the idle line indication for circuit L2 by connecting ground to lead S which is the conventional line busy indication. it remains busy until just prior to the attempt to complete the matching audioconnection when it is made idle once more.
  • Operated contact 3R3 connects ground to terminal of pulse output timer 21 which, after a prescribed timed interval, connects battery to terminal 1 for shunting down the relay 3R winding, releasing it for making circuit L2 appear special by removing ground from lead 8.
  • video network control 17 automatically sends a signal to verification control 20 to begin a verification check of the connection.
  • Control 20 couples a verify signal to leads T and R which connect to converter 1 and also via cable x, switch SW3 to leads FR and PT.
  • the audio transmission path is split at trunk 4 and the calling line connects to leads T and R while the called line connects to leads FT and FR.
  • the signal coupled to leads T and R it may be traced to calling line circuit L1 via switch SW1, trunk and converter finder stages, trunk 4 and finder F.
  • the path for connecting the verify signal to called line circuit L2 may be traced via leads FR and PT, trunk and converter finder stages, trunk 4, selector SEL, intermediate selector stages and connector C.
  • the calling and called line identities are presently stored in respective store 15 and translator 16 of control 2.
  • network control 17 which directs signal scanner 14 to monitor two of leads SCO-SCn corresponding to the calling and called identities.
  • one of the leads SC(O- n) connects to audio line circuit L2 and thereat couples to the transmission path, leads T and R.
  • leads FT and FR from converter 1 connect to respective leads T and R of the called line circuit via the switch train and therefore the verify signal is coupled to the lead SC(O-n) corresponding to the called line circuit L2.
  • the verify signal is coupled at calling line circuit L1 to another one of leads SC(On) If signals are detected on monitored leads SC(O-n) by scanner 14, a check signal is returned by scanner 14 to control 17 which subsequently controls the release of video control '2 and converter 1 from the connection, the latter as disclosed in Kuchas.
  • control 20 If scanner 14 within a predetermined interval fails to return the check signal, control 20 signals network control 17 that a call blockage condition exists. See the discussion under the heading Call Blockage for additional details.
  • Video Call To Unequipped Lines In the event the caller requests a video-audio connection to a terminal not equipped to receive video calls, that request is intercepted by the video switching equipment.
  • Customers not equipped with video apparatus have their corresponding leads 'IT(O-n) cross connected at busy-idle test 18 for interception in a conventional manner. If a video-audio connection is requested for such a customer line, test 18 automatically sends a signal to control 17 for releasing the video equipment as above described. The call thereafter progresses as an audioonly call and is established by the audio switching equipment in a conventional manner.
  • a communication system comprising: first and second separate switching systems each being responsive to calling signals for interconnecting customer stations via respective first and second connections;
  • control means connected between said systems and controlled by a calling one of said stations for selectively coupling calling signals received in said first system to said second system for actuating said second system to establish a second connection between said calling station and a called one of said stations;
  • said removing means comprises timing means activated upon the completion of said second connection for timing a predetermined time interval after which said first connection is completed to said called station.
  • said first switching system includes circuitry controlled by said control means for establishing a portion of said first connection concurrent with the establishment of said second connection.
  • said first switching system comprises outpulsing means for sending directing signals representative of an address of said called station for controlling the establishment of said first connection, and further including means in said second switching system for controlling said outpulsing means to send only a portion of said directing signals before said second connection is established and the remaining portion after said second connection is established.
  • circuitry actuated after the establishment of said first and second connections for verifying that said established first and second connections originate at the same calling station.
  • said verifying circuitry includes means for connecting a special signalto said first connection; means at said calling and called stations coupling said special signal to said control means; and I means in said control means for detecting said special signal to verify that said first and second connections originate at said calling station.
  • said first switching system includes means for recording said signals
  • said control means includes digit detector means connected to said recording means for detecting a video service code in said signals for actuating said second switching system to establish a second connection between said calling and called stations.
  • an audio line circuit and video line circuit for connecting each customer tenninal respectively to an audio switching system and to a video switching system
  • the invention set forth in claim 10 further including means actuated a predetermined time after the establishment of a call connection to said video-line circuit for removing said signal to permit the establishment of said prescribed call connection via said audio switching system to said audio line circuit.
  • a video switching system for augmenting an audio switching system to furnish in response to a video service request signal a video path via a separate network in the video switching system in conjunction with an audio path established via said audio switching system comprising:
  • the invention set forth in claim 12 further including:
  • inhibiting means connects to said digit outpulsing apparatus for controlling said apparatus to withhold a portion of said directing signals until said video path is established.
  • said video line circuit comprising means responsive to a video path connection thereto for sending a busy signal to said associated audio line circuit;
  • said audio line circuit including means for connecting said busy signal to said audio switching system prior to the establishment of said audio path for preventing the establishment of all paths via said audio line circuit to said customer equipment.
  • said video line circuit includes means automatically actuated after a predetermined time interval for removing said busy signal from said audio line circuit to permit the exclusive establishment of said audio path to said audio line circuit.
  • verifying circuitry comprising:
  • the invention recited in claim 16 including means activated by said detecting means for releasing saidvideo path to convert the connection from video-audio connection to an audio-only connection.
  • means in said audio system responsive to calling signals for establishing a portion of said audio connection between a calling and a called station;
  • means in said video system for establishing said video connection between the calling and called stations in response to said signals;
  • a communication system including:
  • Equipment for establishing audio and video path connections between respective calling and called customer audio and video line circuits comprising:
  • an audio switching system for controlling the establishment of said audio path and a video switching system for controlling the separate establishment of a video path;
  • said audio switching system including a switch train responsive to directive signals for extending a connection between customer line circuits;
  • said video switching system including a prefix digit detector for detecting a video service code sent by said calling customer and stored in said converter;
  • a video controller activated by said detector for controlling the establishment of said video path from said calling customer video line circuit to said called customer video line circuit;

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
US801575A 1969-02-24 1969-02-24 Equipment to coordinate establishment of audio and video connections through switching systems Expired - Lifetime US3573377A (en)

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Also Published As

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DE2008284A1 (de) 1970-10-29
ES377062A1 (es) 1972-05-16
BE746279A (fr) 1970-07-31
DE2008284B2 (de) 1972-09-28
FR2035624A5 (xx) 1970-12-18
AU1151970A (en) 1971-08-19
GB1297565A (xx) 1972-11-22
NL7002334A (xx) 1970-08-26

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